From these tests, Volvo has created the Driver Alert system. If the car concludes that the driver is drowsing (more on that later), it issues an audible alarm, and an . Assistance systems simply explained: How the driver alert system can help you to reach your destination safely and relaxed after long journeys. StopSleep offers driver alert system, fatigue detection, electronic anti-sleep alarm aim to help drivers stay awake and aware at all times.